Ultrasonic Testing of Gold and Silver Bars and Bullion
Ultrasonic Testing of Gold Bars and Silver Bullion
Ultrasound testing is a non-destructive method to conclusively test and gold and silver bars. The technology measures the sound velocity of gold and silver, a unique physical property determined by elasticity and density. By comparing the distance sound waves travel through bullion with actual thickness, ultrasonic testing detects counterfeit bars with tungsten or lead alloy inserts. The method authenticates gold bullion and silver bullion in the form of both minted and cast bars.
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Testing a real gold bar
Testing a fake silver bar
The videos demonstrate how ultrasonic testing is used to test gold bars and test silver bars, to identify counterfeits with concealed fake cores. The ultrasonic gold testing machine measures the sound velocities of precious metals, which varies due to differences in elasticity. While gold and tungsten share similar densities, their sound velocities differ significantly, allowing ultrasonic testing to detect fake gold bullion. Similarly, lead alloys have comparable densities to silver but distinct sound velocities, enabling the detection of counterfeit silver bullion. By comparing the measured distance ultrasound travels to the known thickness of the bullion, ultrasonic testing ensures accurate verification of gold and silver bars.
Ultrasonics is an advanced technology providing a simple solution to a complex problem. I think it would be impossible to put an insert into a gold bar that you couldn’t detect with ultrasonics.
Gold bullion bars have been fraudulently adulterated through the insertion of slugs of inexpensive base metal of similar density. These insertions are difficult or impossible to detect through weighing, radiography, or X-ray fluorescence, so some precious metals processors have resorted to drilling or cutting bars to verify integrity. However a simple ultrasonic test can quickly and reliably locate inserts with no need to drill, cut, or otherwise alter the bar.
According to our research Chinese counterfeiters are flooding the US, and Europe with very high quality fake US silver dollars, gold coins, gold bars – you name it. We would call this a disaster for the investor, and our big fear is there are probably tens of thousands of investors in the United States, who have been duped.
Bullion fraud is a global threat, with criminals using sophisticated methods to produce plated fake gold bars and hollowed-out fake silver bars. Tungsten, which has a density nearly identical to gold, and lead-tin alloys, which mimic the density of silver, are used to create counterfeit bullion. Non-destructive methods, such as density tests and X-ray spectrometry, can fail to detect these fakes. Ultrasonic testing provides a conclusive solution to detect both fake gold bars and fake silver bars. By testing the unique sound velocities of precious metals, an ultrasonic gold and silver tester ensures authenticity, making it an indispensable tool for traders and investors in bullion.
